Ben Thompson, in a post titled "The Cost of Bitcoin." Emphasis mine.
The implication for apps is clear: any undifferentiated software product, such as your garden variety app, will inevitably be free. This is why the market for paid apps has largely evaporated. Over time substitutes have entered the market at ever lower prices, ultimately landing at their marginal cost of production – $0.
The same story applies for music, movies, content, etc., and this has fundamentally changed what it means to do business on the Internet. It’s why, for example, WhatsApp was so valuable to Facebook: attention is the true finite resource, and how it’s commanded is, in some ways, besides the point.
Bitcoin and the breakthrough it represents, broadly speaking, changes all that. For the first time something can be both digital and unique, without any real world representation. The particulars of Bitcoin and its hotly-debated value as a currency I think cloud this fact for many observers; the breakthrough I’m talking about in fact has nothing to do with currency, and could in theory be applied to all kinds of objects that can’t be duplicated, from stock certificates to property deeds to wills and more.